This seems a little quick, considering the Ultimate Pencil Superdrop just launched on May 12th
A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
Contents: 2 60-card, Standard-legal decks
Kefka, Court Mage / Kefka, Ruler of Ruin Both Kefka, Court Mage and Kefka, Ruler of Ruin offer card draw, but Im most interested in the front half of the card
This can allow you the ability to quest without too much concern
Archon generates card advantage and impacts the board when it ETBs or attacks, just like the Titan cycle